Trish - My favorite "green food" is roasted asparagus with garlic and lemon. It is super easy and fast, and it can be cheap when asparagus is on sale. I think it could work with broccoli too. Remind me, and I will post something for asian style green beans this weekend.
Preheat your oven to hot (425 or even broil, depending on what else you are cooking). Take one bunch of fresh asparagus spears, wash, and cut off the tough "thick" ends. Leave the spears long. You could use frozen spears if you microwave them just long enough to almost thaw them. Spread the spears in a single layer on a cookie sheet. Drizzle them with olive oil, coarsely chopped garlic (use whole cloves if you are lazy), salt and pepper to taste. I squeeze half a lemon and sprinkle some lemon zest on them before roasting too. Roast them on the top shelf of the oven until they start to get barely brown, then turn the spears with tongs. Roast a few more minutes until they are done. They are done when they are all bright green, have a few brown spots, and aren't burnt. Squeeze the other half of the lemon on the spears, grate some more zest over them, and eat.